Base for leakproof electrochemical cells and method of forming t

Details Base for leakproof electrochemical cells and method of forming t Base for leakproof electrochemical cells and method of forming t

1974-08-01

1976-04-20

Walton, Donald L.

Batteries: thermoelectric and photoelectric

Thermoelectric

Radiation pyrometer

136175, H01M 204

Patent

active

039516903

ABSTRACT:
A method and device for providing leak-proof sealing of dry electrochemical cells allowing excellent tightness to be obtained. Onto the bottom of a metallic cup-shaped negative electrode of the cell is fitted a dish having a central protrusion and apertures positioned in a peripheral zone outwardly of the protrusion. A hot thermoplastic material is then employed for blocking or sealing the apertures in the dish, thus creating a mass of the plastic material on both sides of the apertures. At the same time the mass is bonded to the thermoplastic casing, inside which the cup of the cell is enclosed. The material used for blocking the apertures may be injected from the outside, placed in advance in the dish prior to fitting the latter to the cup, or be provided by a part of the casing itself, which part extends for a sufficient length beyond the bottom of the cup. The cell sealed in this manner does not need to be encircled by a metallic ring. The cell bottom contains an electric contact formed by the protrusion of the dish. The remainder of the dish, covered with a plastic material, is uniformly joined with the casing.

REFERENCES:
patent: 2346640 (1944-04-01), Anthony
patent: 3501351 (1970-03-01), Karobath
patent: 3823039 (1974-07-01), Sanchez

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